3&#39;, 6&#39;-diaminofluoran derivatives of gamma-lactam



United States Patent Q 3,185,696 3',6'-DIAMINOFLUORAN DERIVATIVES F 'y-LACTAM Jack M. Tien, Tainan, Taiwan, China (32 Willow St., Beacon, N.Y.) No Drawing. Continuation of application Ser. No. 798,846, Mar. 12', 1959. This application Mar. 14, 1962, Ser. No. 179,787

14 Claims. (Cl. 260-295) This invention relates to new and valuable compounds, their uses and their method of manufacture and more particularly it relates to new fused-lactam of the rhodamine series and is a continuation of my application Serial No. 798,846, filed March 12, 1959, now abandomed.

The novel compound which is useful as a coloring agent in its non-dye color form, may be presented by the tollowing formula: V

B N-R C Aryl-HN-QQU-NH-Aryl wherein B is an ortlmo divalent carbocyclic madical of the aromatic residue and R is a member chosen from the group consisting of hydrogen, alkyl, aryl, aroyl, pyridyl, pyrimidyl, pyrazinyl, acridinyl, quinoiinyl, bis(4-dimethylaminophenyhmethyl, bis(4-methylamino 3 methylphenyhmethyl, NH-a1kyl, NH-aryl and NH-acyl and these cyclic radicals may be substituted by a member of the group halogen, nitro, hydmoxy, lower alkyl, lower alkoxy and cyano.

The following formulas are the examples of the novel compounds:

3,185,695 Patented May 25, 1965 N-NHO O-pyridyl I IL-Aryl QHN'V ll 0 mt l L-NH-Aryl \C CH3 3 O 01- it 01 N-Aryl The method of producing the novel compounds is by condensation of arhodarnine with ammonia or its organic derivatives, The reaction may be presented by the following equation:

wherein B and R have the same meaning as defined herein above. a

The condensation products of a polyethyl rhodamine base or its salt with ammonia or its organic derivatives are old. The use of ammonia and aniline or toluidine were disclosed in 1895 in German Patents 81,264 and 80,153 and the use of phenylhydrazine and nitroaniline were disclosed in 18 96, in German Patents 85,242 and 88,675. In so far as I am aware that no one has produced any condensation products as definedin the first structural formula. These whole series of the new derivatives distinguish themselves from the conventional condensation products of rhodamine B and ammonia or its organic derivative by their Unique thermochromic property, their different shade in color from their parent compound, their excellent light fastness and their far greater stability both to the atmosphere, and in storage.

A general process for preparing the new compounds of this invention involves condensing essentially equimolecular amounts of a rhodarnine and ammonia or its primary organic derivative, or an excess of the latter, in presence or absence of a condensing agent, usually phosphorus oxychloride'. It is advantageous in carrying 'out this condensation reaction by heating the reaction mixture to accelerate the production of the condensation product. Temperature which may be employed, ranges from 50 to 260, mostly the reflux temp'erature of the reaction mixture. The latter will, of course, vary depending on the pressure, reactants and the specific solvents, if any, employed, usually a halogenated hydrocarbon such as chloroform, carbon tetrachloride, methylenehalide or an alcohol such as ethanol, isopropyl alcohol and 2-ethylbutanol. The reaction time varies from one hour to 12 hours, depending on the temperature, the pressure and the startingin'aterials employed. The new compounds of this invention are producedin substantially colorless or non-dye-color solids which are capable of producing dye color immediately upon intimate contact with a color initiator such as a clay, a zeolite, a phenol and/ or a hetero polyacid.

The shades of the color range from pink, red, blue, purple to gray. Some of them in their normal state, namely nitro derivatives, are yellow or yellow-orange in color. Since this color is itself not a dye color, it is to be understood that the substantially colorless solids also include the yellow and the yellow-orange solids. It is also to be understood that the cyclic monovalent radicals such as aryl, pyridyl, pyrimidyl, pyrazinyl, quinolinyl, acridinyl, cycloparaflinyl and the like, as used above and elsewhere herein are to mean both unsubstituted and substituted radicals.

The suitable rhodamines which may be employed in thislinvention, include the following: 3',6-bis(anilino)fluoran 3,6'-bis (anilino) -4,7-dichlorofluoran 3,6'-bis(anilino)-4,5,6,7-tetrachlorofluoran 3 ,6,'-bis (4-cyolohexylanilino fiuoran 3 ',6'- bis (4-ethoxyanilino) -4,7-dichlorofluoran 3',6-bis (4-ethoxyanilino fiuoran 3 ',6'-bis (halopyrimidylamino fiuoran 3 ',6'-bis (halopyridylamino fiuoran 3 ',6'-bis (Z-methylanilino) fiuoran 3',6'-bis (2-methyl-3-chloroanilino fiuoran 3',6-bis (methyl-pyridylamino fiuoran 3',6'-bis (naphthylamino fiuoran 3 ',6'-bis (pyridylamino fiuoran 3',6'-bis (pyrimidylamino fiuoran 3 ',6'-bis (2,4,6-trimethylanilino fiuoran Among the ammonia organic derivatives which may be employed, are in the following. 7

(l) Unsubstituted primary amines: Laurylamine, palmitylamine, mirsitylamine, stearylamine, aminopyridine, aminopyrimidine, aminopyrazine, aminoquinoline, l-aminoisoquinoline, aniline, arninoacridine, aminobiphenyl, aminonaphthalene, aminophenanthridine cyclohexylamine, and aminoan'thraquinone. i

(2) Monos ubstitutedprimary amines: Aminoacetani lide, aminoacetophenone, aminobenzonitrile, 'aminopicoline, aminophenol, 2-amino-nitropyridine, 2-amino-3-nitropyridine', anisidine, 2-chloro-5-aminopyridine, 5-chloro- Z-arninopyridine, 2-ethoxy-5-aminopyridine, Z-hydroXy-S- aminopyridine, bromoaniline, nitroaniline, chloroaniline, chloronaphthylamine, nitronaphthylamine, phenetidine, and toluidine.

(3) Disubstituted primary amines: chlorotoluidine, chloronitroaniline, chloromethylaminopyridine, dichloro- 'aminopyridine, 2,6-dihydroxy-4-arninopyridine, dihaloaniline, dietlroxyaniline, dinitroaniline, methylanisidine, nitrotoluidine, 2,4,6-triaminopyridine, xylidine, 2-methoXy-5- nitroaniline, and 2-amino-4-nitrophenol.

(4) Trisubstituted primary amines: 2-amino-4-nitroaniline, 2-bromo-4,6-dinitroaniline, 6-chloro-3-nitro toluidine, 6-chloro-4-nitro-m toluidine, 3,6-dibrorno-4-nitroaniline, 3,5-dinitro-o-toluidine, tribr'omoaniline, trichloroaniline, and trimethylaniline.

(5) Polysubstituted primary amines: Tetrabromoaniline, tetrachloroaniline, pentabromoaniline and pentachloroaniline.

(6) Aliphatic acyl hydrazines: Lauroylhydrazine, palmitoylhydrazine, myristoylhydrazine and stearoylhydrazme.

(7) Aroyl hydrazines: Halogenated aroyl hydrazine, cyanoaroyl hydrazine, lower alkyl aroyl hydrazine, lower alkoxy aroyl hydrazine, hydroxyaroyl hydrazine, nitroaroyl hydrazine, halo-nitro -aroyl hydrazine, halo-loweralkyl-aroyl hydrazine, halo -hydroxy-aroyl hydrazine, halq-loweralkoxy-aroyl hydrazine, halo-cyanoaroyl hydrazine, nitro-loweralkyl-aroyl hydrazine, nitro-loweralkoxy-aroyl hydrazine, and cyano-loweralkyl-aroyl hydrazine.

(8) Pyridine carbo hydrazines: Halogenated pyridine carbo hydrazine, lower alkyl pyridine carbo hydrazine, nitro-pyridine carbo hydrazine, pyridine carbo hydrazine, 2,6 dihydroxy 4 pyridylcarbohydrazine, 2,6-dihalo-4- pyridylcarbo hydrazine, 2,6 dihydroxy 3,5 dihalo 4- pyridylcarbo hydrazine and tetrachloro 4 pyridylcarbohydrazine. t

(9) Phenylhydrazines: Phenylhydrazine, bromophenylhydrazine, chlorophenylhydrazine, ethylphenylhydrazine, methylphenylhydrazine, ethoxyphenylhydrazine, methoxyphenylhydrazine, dichlorophenylhydrazine, dibromophenylhydrazine, 2,4 dimethylphenylhyrazine, 3 chloro 2- methylphenylhydrazine, chloro 2 methoxyphenyl hydrazine, and 2,4,6-trimethylphenylhydrazine.

Polycyclic aroyl and heteroaryl hydrazines: 1- chloro 2 naphthylhydrazine, 2 hydrazinofiuorene, 6- quinolylhydrazine.

The following examples Will serve to illustrate the present invention without being limitative thereof:

Example 1 To a solution in chloroform of equimolecular amounts of 3',6'-bis(anilino)fiuoran and chlorotoluidine is added, dropwise equivalent amount of phosphorus oxychloride, The mixture is then refluxed for 3 to 4 hours. After removal of volatile material under suction as completely as possible, the semisolid residue is dissolved in dilute hydrochloric acid, if necessary, with the aid of heat. The purplish crude product is precipitated out by adding sodium acetate, separated by filtration and washed with suflicient water to remove the inorganic salts. This is followed by washing with ethanol to remove any unreacted starting material. The latter process is repeated until the purplish color of the crude solid almost disappears. Recrystallization from hot benzene or a mixture of ethanol and benzene gives colorless crystals. The product has the formula:

ll CH 01 Example 2 The procedure of Example 1 is repeated in employing 3,4-dichloroaniline or a halogenated carbocyclic primary amine of the aryl series in lieu of the chlorotoluidine. The resulting product is a colorless solid and has the formula:

The procedure of Example 1 is repeated in employing nitroaniline or a nitrated carbocyclic primary amine of the benzene series in lieu of the chlorotoluidine. The

resulting product is a reddish yellow powdery solid and has the formula:

v @m o/ Example 4 The procedure of Example 1 is repeated in employing 3',6'-bis(2,4,6-trimethylanilino)fiuoran and 2,4-dichloroaniline or a halogenated carbocyclic primary amine of the aroyl series in lieu of 3',6-bis(anilino)fluoran and chlorotoluidine. The product is a colorless solid and has the formula:

cm CH3 CH -QHN O NH-QCH;

Example 5 The procedure of Example 1 is repeated in employing 3,6'-bis(2,4,6-trimethylanilino)fluoran and nitroaniline or a nitrated carbocyclic primary amine of the benzene series in lieu of 3',6-bis(anilino)fluoran and chlorotoluidine respectively. The product is an orange-yellow solid and has the formula:

A mixture of 3',6-bis (anilino)dichlorofluoran and xylidine in 1:10 gram molecular weights is heated at to C. for five to six hours. The crude solid which is isolated with aid of acetic acid, is recrystallized from hot benzene. The product is produced as colorless solid and has the formula:

CH3 or I /N O U la -Q O Example 7 The process of Example 6.is repeated in using 336'- bis(1-naphthylamino)fluoran and tolylhydrazine instead of the aromatic series in a pressure vessel is slowly heated of 3,6'bis(anilino)dichloroiluoran and xylidine respect-ively. The product is a White solid and has a formula:

i l0 8 HN 8 Example 8 The same process as in Example 6 is repeated in using 3,6'-bis(4-cyclohexylanilino)fluoran and 2-arninomethylpyridine instead of the starting material previously used in Example 6. The product is a colorless Igrainy solid and has the formula:

0 it I CH3 N \N Example 9 The same process of Example 6 is repeated in using 3,6-bis(3-chloro-2-methyianilino)fluoran and chloroaniline, instead of starting material previously used in the Example 6. The product is a'white solid and has the to about 170 C. and kept at this. temperature for6 to 7 hours. The colorless solid product isolated'has the formula: V

I? l 0 Cl o OZHbwQ-HNOL NEQ-wnn Example 11 The method of ExamplellO is repeated by replacing 2,5-dichloroaniline with 'nitroaniline or a nitrated carl s V b'ocyclic primary amine of the benzene series. The reddish yellow solid product has the formula:

Example 12 The method of Example 10 is repeated by replacing 2,5-dichloroaniline with 2,4-dichlorobenzoylhydrazine or a hydrazide of the aromatic series. The colorless solid product has the formula:

7 Example 13 The method of Example 10 is repeated in replacing 2,5-dichloroani-line with pyridine carboxylic acid hydrazide or 2,6-dichloro-4pyridyloarbohjydrazine. The white grain product for the former has the formula:

law

C CEHEO-QHNQ QNEQO can Example 14 The starting material of Example 10 is replaced by 3',6'v-bis(4-ethoxyanilino)-4,5,6,7-tetrachlorofluoran and 3-aminoquinoline and the process is repeated. The resulting pale white solid product has the formula:

C1 0 Olga /N 6 N- Example 15 A-mixture in ethanol-chloroform of equimolecular amounts of 3',6'bis(2 mcthylanilino)fiuoran and bromoaniline is heated slowly to about C. under pressure The white solid isolated has the Example- 16 The process of Example 15 is repeated in employing nitro-aniline, or a nitrated primary amine of the benzene series in 'lieu of bromoaniline. The orange-yellow solid product isolated has the formula:

' O l on. CH3 Q U' Q Example 17 for 4 to 6 hours.

formula The process of Example 15 is repeated in employing 3,4-dichlorobenzoylhydnazine or an acyl hydrazine of the aroyl series in lieu of bromoaniline. The white powder product isolated 'has the formula:

V QOQ -Q H3 I V Example 18 An ethanol solution of 3,6' -bis(2,4,6 trimethylanilino)fluoran is saturated with ammonia gas at C.

under substantially anhydrous'conditions, slowly heated to 160 to 180 C. and held at this temperature fior -6 A colorless fluid containing the compound of Example in a chlorinated biphenyl liquid (trade name, Aroclor 1242) is applied on a foot or linger in the form of a thin film. As quickly as a surfiace bearing a zeoli te or a clay is pressed against the foot or tfinger, a clear, vivid and intense blue image of the foot or linger print is duplicated on said surface. Yet no color [develops on the toot or on the finger.

1 0 Example 20 The process of Example ,19 is repeated on a surface carrying a hydrated aluminum silicate of a flexible and uniformly thick sheet material, in employing the compound of Example 417 in die'thyl adip-ate instead of the compound of Example 410 in chlorinated biphenyl. There is no visible foot or finger print. However, the violet foot or finger print occurs immediately when the sheet is exposed to a radiation rich in infra-red or merely by being placed in contact with a hot iron.

Example .21

-A piece of white cotton or wool fabrics is impregnated with a benzene solution containing the compound of Example 12 and dried. On being dipped into a warm Water bath containing phosphotungstic acid, the treated fabrics turn vivid blue instantaneously and permanently. Yet the water vbath remains crystal clear and colorless.

Example 22 A pure white mixture of U .SJP. kaolin clay or propyl gallate and the condensation product of 3',6 bis(4- ethoxyanilino)-4,7 dichlorofluoran and benz-oic acid hydrazide is placed on a white index card in the form of a thin layer. On being pressed with a spatula, exposed to infra-red radiation or put on a hot iron, the mixture immediately and permanently becomes vivid blue.

Example 23 The condensation product of Example 13 is dissolved in dilute acetic acid at room tempenature. The resulting solution is colorless. But it turns intense blue on being exposed to heat and becomes colorless again on cooling. The thermochromic property of this solution can be easily repeated.

What is claimed is:

1. A compound of the formula wherein B is a member selected from the group consisting of o-phenylene, halo-o-phenylene and o-naphthylene; Aryl is a member selected from the group consisting of cyclohexylphenyl, naphthyl and where n is an integer from '1 to 4 and h is a member chosen from the group consisting of hydrogen, lower alkyl, hydroxy, lower alkoxy and halogen; R is a member selected from the group consisting of hydrogen, alkyl of from 1 to 18 carbon atoms,

(kn, (ion, NBC-(lower alkyl), NH (10..

NE (k) n. NHGO-(alkyl of from 1 to 18 carbon atoms) NHCO kin, NHCO k n 1 1 where -k is a memberselected from the group consisting of hydrogen, lower alkyl, hydroxy, lower alkoxy, nitro, halogen and cyano and n is an integer from 1 to 4.

2. The compound of claim 1 in which B is dichloroo-phenylene, Aryl is p-ethoxyphenyl and R is where k and nhave same meaning as defined above.

3. The compound of claim '1 in which B is id chloroio-phenylene, Aryl is p-ethoxyphenyl and R is NHC O (k)n where k and n have same meaning "as defined above.

4. The compound 01: claim 1 in which B is o-phenylene, Aryl is phenyl and R is where k and n have same meaning as defined above.

5. The compound of claim 1 in which E is o-phenylene, Aryl is phenyl and R is NBC O (11),;

where k :and n have same meaning as defined above.

6. The compound of claim 1 in which B is o-phenylene, Aryl is meohylphenyl and R is where k and n have same meaning as defined above.

'12 8. The compound of claim 1 in which E iso-phenylene, Aryl is 2,3,4-trimethylpheny1 and R is where k and n have same meaning as defined above.

9. Thecompound of claim 1 in which B is o-phenylene, Aryl is 2,3,4-trimethylpheny1 and R is NH0 0 (k)n where k and n have same'meaning as definedabove.

10. The compound of claim 1 iniwhich B is o-phenylene, Aryl is phenyl and R is dichlorophenyl.

11. The compound of claim 1 in which B is o-phenylene, Aryl is ethoxyphenyl and R is nitrophenyl.

12. The compound of claim 1 in which B is dichloroo-phenylene, Aryl is p-ethoxyphenyl and R is NHCO- pyridyl.

13. Thecompound of claim 1 in whichB is o-phenylene, Aryl is phenyl and R is NHCO-dichlorophenyl.

14. The compound of claim 1 in which B is o-phenylene, Aryl is phenyl and R is where k and n have same meaning as defined above.

References Cited in the file of this patent UNITED STATES PATENTS 1,708,635 Schoner et a1 Apr. 9, 1929 2,104,505 Berthold Jan. 4, 1938 2,576,293 France-et a1 Nov. 27, 1951 

1. A COMPOUND OF THE FORMULA
 12. THE COMPOUND OF CLAIM 1 IN WHICH B IS DICHLOROO-PHENYLENE, ARYL IS P-ETHOXYPHEYNL AND R IS NHCOPYRIDYL. 